from __future__ import annotations

import pathlib
from typing import Optional

from ..lin.base import LinInterface


class HexFlasher:
    """Stubbed ECU flasher over LIN.

    Replace with your actual UDS/XCP flashing sequence. For now, just validates the file exists
    and pretends to flash successfully.
    """

    def __init__(self, lin: LinInterface) -> None:
        self.lin = lin

    def flash_hex(self, hex_path: str, *, erase: bool = True, verify: bool = True, timeout_s: float = 120.0) -> bool:
        path = pathlib.Path(hex_path)
        if not path.is_file():
            raise FileNotFoundError(f"HEX file not found: {hex_path}")
        # TODO: Implement real flashing over LIN (UDS/XCP). This is a placeholder.
        # You might send specific frames or use a higher-level protocol library.
        return True